{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "extracted_events": [
              {
                "introduced": "6.23.0"
              },
              {
                "fixed": "6.29.1"
              },
              {
                "introduced": "7.18.0"
              },
              {
                "fixed": "7.30.1"
              },
              {
                "introduced": "8.0.0"
              },
              {
                "fixed": "8.12.2"
              }
            ],
            "source": "AFFECTED_FIELD"
          },
          "events": [
            {
              "introduced": "fbc31e21d7e1dffea61166ab7a827f74b6483d26"
            },
            {
              "fixed": "8c57f6c68c95465338ae97bfc991cb1513d2f76e"
            },
            {
              "introduced": "ebe3e33ea4d25402e0dc12dcc67902fdb7f231d4"
            },
            {
              "fixed": "7507102a675b082a71437f0a00681e537875556c"
            },
            {
              "introduced": "d7fbba51772deecb830a297647456a5e9f9fec57"
            },
            {
              "fixed": "bb6cc0ae9b6827ed273ed5ba344148273629638f"
            }
          ],
          "repo": "https://github.com/nodejs/undici",
          "type": "GIT"
        }
      ]
    }
  ],
  "aliases": [
    "GHSA-xjj6-f33q-929c"
  ],
  "database_specific": {
    "cna_assigner": "openjs",
    "cwe_ids": [
      "CWE-248",
      "CWE-459"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/109xxx/CVE-2026-109869.json"
  },
  "details": "undici is an HTTP client library for Node.js. In versions 6.23.0 through 6.29.0, 7.18.0 through 7.30.0, and 8.0.0 through 8.12.1, its fetch() implementation crashes the Node.js process when a malicious server returns a response with more than five content codings and closes the connection before sending the body. undici rejects such responses because of a content-encoding limit, but it created the internal response stream before that check and returned without attaching an error listener or aborting the request, so the early close surfaces a content-length mismatch on the orphaned stream, which Node.js treats as an unhandled error and terminates the process. A remote, unauthenticated server can trigger this with a single response, even when the application correctly catches the fetch() rejection, resulting in a denial of service. The issue is fixed in undici 6.29.1, 7.30.1, and 8.12.2, and users should upgrade to one of those versions or later. There is no workaround.",
  "id": "CVE-2026-109869",
  "modified": "2026-10-16T02:31:22.112521746Z",
  "published": "2026-10-15T18:08:31.243Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://cna.openjsf.org/security-advisories.html"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/109xxx/CVE-2026-109869.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/nodejs/undici/security/advisories/GHSA-xjj6-f33q-929c"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-109869"
    }
  ],
  "schema_version": "1.9.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "undici vulnerable to Denial of Service via unhandled error on excessive content-encodings"
}